Today I inspected the drain and trap under the kitchen sink. I haven't really had any specific problem but I guess the drain could be faster. Sometimes I start the disposer to make it drain quicker. I have spotted some sort of grease leaking out of the trap and I will clean that up but my question is - is this an optimal drain plumbing? Something seems off in this installation but maybe it's just my lack of experience.
On the right side, difficult to see in these particular pictures, there is a copper pipe section that goes down to the sewer and also up to a vent on the roof.
Please, forget the section of drywall I removed. I just wanted to see the hot and cold water pipes as I'm also trying to fix a water hammer issue, but that is another story.